Add instructions on usage with Web Author

Author: ctalau

README.md

@@ -5,6 +5,11 @@ Provides support in oXygen for working with LegalDocML files.
 The oXygen XML Web Author shows how a document can be edited in the browser: 
 [Sample LegalDocML](https://www.oxygenxml.com/webapp-demo-aws/app/oxygen.html?url=github%3A%2F%2FgetFileContent%2Foxygenxml%2FlegalDocML%2Fmaster%2Fframeworks%2Flegaldocml%2Fsamples%2Feu_COM%282013%290619_EN-8.xml&tags-mode=no-tags)
 
+Usage in Oxygen XML Web Author
+------------------------------
+
+To use the framework in Oxygen XML Web Author, one needs to download the project and create a ZIP archive containing the `frameworks/legaldocml` folder. This archive should be installed in Oxygen XML Web Author using the instructions here: https://www.oxygenxml.com/doc/ug-waCustom/topics/webapp-add-framework.html . 
+
 Copyright and License
 ---------------------
 Copyright 2018 Syncro Soft SRL.